From: Stefan Rusterholz <apeiros@...>
Date: 2007-07-14T00:17:32+09:00
Subject: Re: Class methods and modules

Pedro Cardoso wrote:
> Hi. Thanks!
> 
> I found another way.
> 
> Module MyModule
>   def m
>   end
> end
> 
> class MyClass
>  extend MyDodule
> end
> 
> MyClass.m
> 
> Can anyone explain the "job" of extend?
> 
> Thanks.

Extend includes the methods in the singleton class. E.g. 
MyClass.extend(MyModue) is (almost) equivalent to:
class <<MyClass
  include MyModule
end
Only almost because iirc a different callback is used.

Regards
Stefan

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